Răspuns:
a) 15-5 =10-5=5-5=0
16-4=12-4=8-4=4-4=0
18-3=15-3=12-3=9-3=6-3=3-3=0
b) 27-3=24-3=21-3=18-3=15-3=12-3=9-3=6-3=3-3=0
45-9=36-9=27-9=18-9=9-9=0
49-7=42-7=35-7=28-7=21-7=14-7=7-7=0
c) 54-6=48-6=42-6=36-6=30-6=24-6=18-6=12-6=6-6=0
56-7=49-7=42-7=35-7=28-7=21-7=14-7=7-7=0
60-6=54-6=48-6=42-6=36-6=30-6=24-6=18-6=12-6=6-6=0
Coronita?